/*
 * Copyright (c) 2007, 2015, Oracle and/or its affiliates. All rights reserved.
 * ORACLE PROPRIETARY/CONFIDENTIAL. Use is subject to license terms.
 */
/*
 * Copyright 1999-2004 The Apache Software Foundation.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
// $Id: JAXPVariableStack.java,v 1.1.2.1 2005/08/01 01:30:17 jeffsuttor Exp $

package com.sun.org.apache.xpath.internal.jaxp;

import javax.xml.transform.TransformerException;
import javax.xml.xpath.XPathVariableResolver;

import com.sun.org.apache.xml.internal.utils.QName;
import com.sun.org.apache.xpath.internal.VariableStack;
import com.sun.org.apache.xpath.internal.XPathContext;
import com.sun.org.apache.xpath.internal.objects.XObject;

import com.sun.org.apache.xpath.internal.res.XPATHErrorResources;
import com.sun.org.apache.xalan.internal.res.XSLMessages;


/**
 * Overrides {@link VariableStack} and delegates the call to
 * {@link javax.xml.xpath.XPathVariableResolver}.
 *
 * @author Ramesh Mandava ( ramesh.mandava@sun.com )
 */
public class JAXPVariableStack extends VariableStack {

  private final XPathVariableResolver resolver;

  public JAXPVariableStack(XPathVariableResolver resolver) {
    this.resolver = resolver;
  }

  public XObject getVariableOrParam(XPathContext xctxt, QName qname)
      throws TransformerException, IllegalArgumentException {
    if (qname == null) {
      //JAXP 1.3 spec says that if variable name is null then
      // we need to through IllegalArgumentException
      String fmsg = XSLMessages.createXPATHMessage(
          XPATHErrorResources.ER_ARG_CANNOT_BE_NULL,
          new Object[]{"Variable qname"});
      throw new IllegalArgumentException(fmsg);
    }
    javax.xml.namespace.QName name =
        new javax.xml.namespace.QName(
            qname.getNamespace(),
            qname.getLocalPart());
    Object varValue = resolver.resolveVariable(name);
    if (varValue == null) {
      String fmsg = XSLMessages.createXPATHMessage(
          XPATHErrorResources.ER_RESOLVE_VARIABLE_RETURNS_NULL,
          new Object[]{name.toString()});
      throw new TransformerException(fmsg);
    }
    return XObject.create(varValue, xctxt);
  }

}
